Smiths Aerospace
Electronic Systems – Malvern
DOC NO.0134ED
MAINTENANCE MANUAL SUPPLEMENT
BOEING B737-100/200/300/400/500
28-41-04
(i) Install a shorting cap on the COMP receptacle on the test unit.
(j) Push the PRESS TO MEASURE switch on the test unit.
(k) Turn the TANK CAP PF thumbwheels until the meter shows the minimum value.
NOTE:
If you turn the thumbwheels to a position farther than the correct position, the value
increases.
1) Turn the D.F. CONTROL knob until the meter shows the minimum value.
NOTE:
If you turn the knob to a position farther than the correct position, the value
increases.
(l) Make sure the thumbwheels are set to the capacitances with the applicable tolerance:
TANK
Capacitance (pF)
TOLERANCE (pF)
Left/Right
458.2
±16
Left/Right 474.2
±16
Left/Right
490.6
±16
Left/Right 506.6
±16
Center Integral
164.2
±4
Center 180.2
±4
Center 1 Cell
129.1
±4
Center 1 Cell
145.1
±4
Center 2 Cell
188.5
±4
Center 2 Cell
204.5
±4
Center 3 Cell
164.2
±4
Center 3 Cell
219.4
±4
Aux
94.5
±4
Aux (400 Gal)
110.5
±4
Aux (810 Gal)
109.2
±4
(m) If the thumbwheels are set to a value out of the applicable range of capacitance values, do
the test for the tank units and the compensator (Ref 28-41-21/501).
(n) Set the battery switch to OFF.
(o) Disconnect the UNSHIELDED wire bundle from the test unit.
(p) Install a shorting plug on the UNSHIELDED wire bundle.
(q) Remove the shorting plug from the COMP wire bundle.
(r) Connect the COMP wire bundle to the LO-Z TANK receptacle on the test unit.
(s) Set the battery switch to ON.
(t) Push the PRESS TO MEASURE switch.
(u) Turn the TANK CAP PF thumbwheels until the meter show the minimum value.
NOTE:
If you turn the thumbwheels to a position farther than the correct position, the value
increases.
(v) Turn the D.F. CONTROL knob until the meter shows the minimum value.
CONFIG
4.3
Page 515
April 19/02
Airplanes with Smiths 2307 Model Fuel Quantity Indicators
with TSU
(BARFIELD SYSTEM TESTER)
EFFECTIVITY
